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Restricted Securities Available For Sale (Schedule Of Restricted Securities Available For Sale By Aging Category) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 37.0 | $ 11.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 16.9 | 42.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.4 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.4 | 1.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 53.9 | 53.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.8 | 2.0
Corporate bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13.1 | 2.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 8.4 | 18.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.2 | 0.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 21.5 | 21.1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.4 | 0.9
US Government and agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 19.8 | 6.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4.9 | 16.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.2 | 0.8
Debt Securities, Available-for-sale, Unrealized Loss Position | 24.7 | 23.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.4 | 0.9
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 2.4 | 1.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 3.6 | 7.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.2
Debt Securities, Available-for-sale, Unrealized Loss Position | 6.0 | 8.9
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 0.0 | 0.2
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1.7 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.0 | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 1.7 | 0.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | $ 0.0 | $ 0.0

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